Red Seal Electrician Practice
AC theoryQuestion 1468 of 1506

A capacitor of 40 µF is connected to a 60 Hz supply. What is its capacitive reactance?

  1. 133 Ω
  2. 66.3 Ω
  3. 0.0663 Ω
  4. 417 Ω
Show answer

Correct answer: 66.3 Ω

XC = 1 ÷ (2πfC) = 1 ÷ (2 × 3.1416 × 60 × 40 × 10⁻⁶) = 66.3 Ω.

Source: Computed, 4.2: AC Capacitor Circuits

Practice ac theory

Questions last reviewed: 18 October 2026